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Safety Cue
Task-specific safety guidance for ordinary veneer-installation hazards.
Chapter 12
Install Stone Veneer on a Practice Wall
Install one adhered or anchored stone-veneer practice section using the exact approved system for substrate, lath, scratch coat, setting mortar, joints, and drainage.
Field Cue System
These cues appear at the point of work. They identify safety, code, manufacturer, and measurement issues before they become rework, structural risk, or moisture damage.
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Critical Safety Cue
Serious injury, structural failure, or major water-management damage is possible.
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Field Safety Cue
Practical work-area safety: silica control, scaffold access, footing, and housekeeping.
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Code Alert
Local requirements vary. Verify permit, inspection, and jurisdictional rules.
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Manufacturer Cue
Follow product-specific instructions for lath, scratch coat, setting mortar, and stone.
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Measurement Cue
Clearance, joint, lap, and drainage guidance.
Job Overview
This chapter qualifies you to install one complete stone-veneer practice section using the exact approved system named in your project documents — adhered manufactured stone, adhered natural stone, anchored stone veneer, or another approved assembly. The finished work product is one inspected, cured stone-veneer section with confirmed substrate preparation, WRB continuity, lath and scratch coat where required, full-contact setting, consistent joint width, preserved drainage, and documented adhesion.
This chapter depends on the readiness plan produced in Chapter 1, the controlled work area and silica protections established in Chapter 2, and the cutting procedures in Chapter 10. It follows directly from Chapter 11, which installed brick veneer using ties, cavity, and flashing; this chapter installs stone veneer using the different but equally exact system requirements for scratch coat, lath, and setting mortar. Do not treat the two chapters as interchangeable procedures.
Stone veneer fails most often from a mismatched system — natural-stone setting methods applied to manufactured stone, or anchored details substituted where an adhered system was specified. This chapter requires you to identify one system, confirm its exact requirements, and follow it without substitution.
Skills You Will Demonstrate
- RM-067 — Prepare the substrate, confirming WRB continuity, lath installation, or anchor supports exactly as the selected system specifies.
- RM-068 — Apply a scratch coat where the selected system requires one, to specified thickness, scoring, and cure.
- RM-069 — Select the stone layout, blending size, shape, color, and texture and reserving corner and special units before setting begins.
- RM-070 — Set stone veneer with full mortar contact, correct orientation, and no voids behind the unit.
- RM-071 — Maintain joint spacing consistent with the specified style, whether tight-fit, mortar-joint, or dry-stack appearance.
- RM-072 — Inspect veneer adhesion and drainage, confirming support, joint depth, color distribution, clearances, and preserved weeps and cavities.
Where This Skill Fits
Chapter 11 installed a drained cavity veneer system using ties, flashing, and an open air space behind brick. This chapter installs a different water-management approach: an adhered or anchored stone system where the scratch coat, lath, and setting mortar themselves control moisture management, or where an anchored assembly preserves a drainage cavity behind the stone. Both approaches depend on the same upstream readiness, staging, and mortar-mixing skills from Chapters 1 through 3.
The system-identification judgment practiced here — confirming which stone-veneer system is specified and refusing to blend its requirements with another system's details — is the same judgment tested again in Chapter 13's flashing and weep work and in the Chapter 20 capstone if the veneer option is selected.
Scope and Intended Use
This chapter covers:
- identifying whether the approved project is adhered manufactured stone, adhered natural stone, anchored stone veneer, or another approved assembly, and using only that system's requirements
- confirming substrate, WRB, drainage plane, lath, fasteners, scratch coat, mortar, weeps, clearances, and movement joints against approved documents
- installing WRB layers, drainage mat, lath, or anchored supports exactly as specified, lapping and fastening lath correctly and wrapping corners and openings
- applying, scoring, and curing a scratch coat where the system requires one
- laying out stone for size, shape, color, and texture blend, reserving corner and special units
- setting stone with full contact, correct joint width, and no drainage-cavity contamination
- cutting stone using Chapter 10 controls and cleaning finished faces using compatible, nonaggressive methods
- inspecting adhesion, support, joint depth, color distribution, drainage, and clearances
This chapter does not authorize the learner to:
- mix requirements from two different stone-veneer systems on the same wall section
- install veneer on unsupported trim, sheathing, finish cladding, loose concrete, or an unverified ledge
- proceed without a passed Chapter 1 substrate and water-management inspection
- use sealers, caulk, or cosmetic patching to correct missing flashing, failed drainage, incompatible mortar, or a structural deficiency discovered during this chapter
- alter structural backup framing, add unapproved fasteners to structural members, or change the specified drainage plane design
Any substrate, WRB, or support condition that fails inspection in this chapter must be corrected and reinspected, following the same stop-work discipline established in Chapter 1, before setting stone.
Reference Conventions
Establish these references before any component is installed, and use them consistently across the work order and worksheet.
| Term | Definition |
|---|---|
| Selected system | The single controlling stone-veneer assembly identified in Step 1 — adhered manufactured stone, adhered natural stone, anchored stone veneer, or another approved assembly |
| Scratch coat | The base mortar coat applied to lath and scored to receive setting mortar, used only where the selected system requires it |
| Setting mortar | The mortar applied to the wall or unit back that bonds the stone to the substrate or scratch coat |
| Full contact | Setting mortar coverage across the entire back of the unit with no voids, confirmed by the acceptance standard for this chapter |
| Joint style | The specified joint appearance — tight-fit, tooled mortar joint, or dry-stack — controlling joint width and finishing method |
System Identification Record
Before beginning substrate preparation, record the selected system and its controlling documents directly on the Stone-Veneer Installation Worksheet:
Selected system: ______ (adhered manufactured stone / adhered natural stone / anchored stone veneer / other approved assembly, name: ______)
Approved system specification on hand: ______ (Y/N) Chapter 1 readiness decision on file: ______ (Approved/Conditional, cleared) Substrate and WRB inspection passed: ______ (Y/N, date)
Date started: ____________ Installer name: ____________
Prerequisites
- A completed and cleared Chapter 1 Masonry-Readiness Worksheet for this project, with an Approved or Conditional-cleared decision
- A staged and inspected Chapter 2 work area, including wet-cutting or extraction controls for stone cutting
- A single approved stone-veneer system specification identifying substrate, WRB, drainage plane, lath, fasteners, scratch coat, setting mortar, joint style, weeps, clearances, and movement joints
- Confirmed substrate support capable of carrying the specified stone-veneer weight, verified against the approved drawings rather than estimated
- Mixed mortar prepared using Chapter 3 procedures, matched to the setting-mortar and scratch-coat requirements of the selected system
Common Field Fundamentals
Every stone-veneer installation in this book follows the same sequence: confirm the single system, prepare the substrate exactly as that system requires, apply and cure a scratch coat only where specified, lay out and blend the stone, set it with full contact and correct joints, and inspect adhesion and drainage before calling the section complete.
System identificationOne controlling assembly confirmed before any material is applied
Substrate & WRBContinuity, laps, fasteners, and lath confirmed against the specification
Scratch coatThickness, scoring, and cure controlled only where required
Layout & blendSize, shape, color, and texture distributed before setting begins
SettingFull contact, correct joints, no cavity or weep contamination
CuttingChapter 10 silica controls for every cut stone
CleaningCompatible, nonaggressive method only after adequate cure
InspectionAdhesion, support, joints, color, drainage, and clearances confirmed
System Confirmation and Substrate Judgment
The system identified in Step 1 controls every later step in this chapter. An adhered manufactured-stone system, an adhered natural-stone system, and an anchored stone-veneer system have different substrate weight limits, different lath and scratch-coat requirements, and different drainage strategies. Confirm the system before touching the substrate, and do not substitute a detail from one system into another because it is more familiar or convenient.
RM-067 – RM-072
Installation / Water Management / Inspection
Stone Veneer Practice Section Installation
A. Finished-Project Specification
Deliverable: one stone-veneer practice section built to the single approved system identified in Step 1, with substrate and WRB confirmed, lath and scratch coat installed only where the system requires them, stone set with full contact and blended layout, joints finished to the specified style, cutting completed under Chapter 10 controls, and drainage, adhesion, and clearances confirmed by inspection.
B. System and Component Schedule
| Component | Source Document | Specified Detail | Verified |
|---|---|---|---|
| WRB / drainage plane | Approved system specification | Layer type, lap direction, integration with lath | |
| Lath | Approved system specification | Type, lap, fastener spacing, corner and opening wrap | |
| Scratch coat | Approved system specification | Thickness, scoring pattern, cure time | |
| Setting mortar | Approved system specification | Type, application method, coverage requirement | |
| Stone units | Approved system specification | Size range, color range, texture, back preparation | |
| Joint style | Approved system specification | Tight-fit, tooled mortar joint, or dry-stack appearance | |
| Weeps / clearances | Approved drawings | Weep location and spacing, base clearance above grade and paving |
C. Documentation Requirements
- Photographs: WRB and lath before scratch coat, scratch coat scoring, stone layout before setting, and every concealed water-management detail.
- Drawing references: a citation to the specific system specification section supporting the WRB, lath, scratch coat, setting mortar, and joint style used.
- Batch records: scratch-coat and setting-mortar batch proportions, mix time, and cure conditions from Chapter 3.
- Inspection record: the date, method, and result of the substrate/WRB inspection, the scratch-coat cure check, and the final adhesion and drainage inspection.
D. Acceptance Standards
| Check | Standard |
|---|---|
| System consistency | Every installed component matches the single system identified in Step 1; no detail is borrowed from a different system |
| WRB and lath | Continuous WRB with laps in shingle-lap order; lath lapped and fastened at the spacing specified, with corners and openings wrapped |
| Scratch coat | Applied to the specified thickness, scored per the specified pattern, and cured for the specified time before setting mortar is applied |
| Full contact | No voids behind any set stone unit, confirmed by test-removing and reinspecting a sample unit per the system's testing method |
| Joint spacing | Joint width consistent with the specified style within the tolerance stated in the system specification |
| Drainage and clearances | Weeps unobstructed, drainage cavity (where present) free of mortar bridging, and base clearance above grade and paving maintained per the approved drawings |
| Stop-work conditions | Unsupported substrate, missing WRB continuity, or a discovered structural deficiency; installation of that section stops and is referred to the responsible design authority |
E. System Selection and Substrate Preparation
- Identify whether the selected system is adhered manufactured stone, adhered natural stone, anchored stone veneer, or another approved assembly. Record the selection on the System Identification Record.
- Do not mix system requirements. Confirm every later step references only the identified system's specification.
- Review support, sheathing, WRB, drainage plane, lath, fasteners, scratch coat, mortar, weeps, clearances, and movement joints. Cite the specific specification section for each.
- Confirm substrate and water-management inspection. Verify the Chapter 1 readiness decision is Approved or Conditional-cleared before proceeding.
F. WRB, Lath, and Scratch Coat
- Install WRB layers, drainage mat, lath, or supports exactly as specified. Confirm continuity across the entire installation area.
- Lap and fasten lath in the required orientation. Use the fastener type and spacing named in the system specification.
- Wrap corners and openings. Maintain continuous lath coverage without gaps at transitions.
- Apply scratch coat to required thickness. Measure thickness at multiple points across the installation area.
- Score the scratch coat horizontally or as specified. Use the scoring pattern named in the system specification.
- Allow it to cure. Confirm cure using the moisture meter or the method specified before proceeding to setting.
G. Layout, Setting, and Jointing
- Lay out stone on the ground or work table. Arrange units across the full installation area before setting any of them.
- Blend size, shape, color, and texture. Distribute color and texture variation evenly rather than clustering similar units.
- Reserve corner units and special pieces. Set these aside for their designated locations before general setting begins.
- Clean or dampen stone backs where required. Follow the system specification for surface preparation.
- Apply setting mortar to the wall or unit according to the system. Use the application method and coverage specified.
- Press and move the stone into place to achieve full contact. Use a slight back-and-forth motion where the system method calls for it.
- Maintain joint width and avoid mortar voids. Check joint width against the specified style at regular intervals.
- Do not contaminate drainage cavities or weeps. Remove excess mortar before it reaches a cavity or weep opening.
- Cut stone using Chapter 10 controls. Apply wet-cutting or extraction controls to every cut unit.
- Work from corners and openings according to the approved sequence. Follow the layout sequence stated in the system specification.
- Fill and tool joints where the style requires them. Tool at the firmness specified for the mortar in use.
- Clean stone faces without aggressive acid or high pressure. Use only the cleaning method approved for the identified stone type.
H. Protection, Inspection, and Documentation
- Protect and cure the veneer. Shield the installation from rain, freezing, rapid drying, and impact during cure.
- Inspect adhesion, support, joint depth, color distribution, drainage, and clearances. Record findings on the Stone-Veneer Installation Worksheet.
- Document the complete system. File the System Identification Record, component schedule, batch records, photographs, and inspection results together.
Common Installation Inspection
Inspect every stone-veneer section using the same checks regardless of the selected system.
- System check: confirm every installed component traces to the single system identified in Step 1, with no detail borrowed from a different system.
- Substrate and WRB check: confirm continuity, laps, fastener spacing, and corner wrapping match the approved specification.
- Scratch-coat check: confirm thickness, scoring, and cure time were measured and recorded before setting mortar was applied.
- Setting check: confirm full mortar contact behind a sample unit, correct joint width, and no drainage-path contamination.
- Closeout check: confirm adhesion, support, joint depth, color distribution, drainage, and clearances were inspected and documented before the section is called complete.
Complete the Stone-Veneer Installation Worksheet in the Inspection Checklist section below before proceeding to Chapter 13.
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Failure Points and Troubleshooting
Cleanup
This chapter ends with a cured, documented stone-veneer section, not an assumption that it will bond and drain correctly.
- Confirm every concealed WRB, lath, and scratch-coat photograph is labeled with the item, location, and date it documents
- File the System Identification Record, component schedule, batch records, and inspection results with the Chapter 1 readiness plan for this project
- Clean mixing tools, trowels, and cutting equipment, and dispose of slurry without drain discharge
- Store leftover stone, lath, and mortar materials protected from moisture and contamination
- Retain the worksheet and photographs for use in Chapter 13 flashing and weep work and any later inspection of this section
Field Terms
- Selected System
- The single controlling stone-veneer assembly confirmed before any material is installed.
- Scratch Coat
- A base mortar coat applied to lath and scored to receive setting mortar, used only where the selected system requires it.
- Setting Mortar
- The mortar bonding stone to the substrate or scratch coat.
- Full Contact
- Complete mortar coverage across the back of a set unit, with no voids.
- Lath
- The metal reinforcement fastened over the WRB to receive scratch coat.
- Drainage Plane
- The continuous water-shedding layer behind the veneer assembly.
- Joint Style
- The specified joint appearance controlling joint width and finishing method.
- Weep
- An opening that allows drainage water to exit a masonry or veneer cavity.
- Stone-Veneer Installation Worksheet
- The document recording system identification, component verification, batch records, and inspection results for this chapter.
- Movement Joint
- A designed gap that accommodates differential movement without rigidly bonding veneer across it.
Skill Check
- Why must the stone-veneer system be identified and recorded before any substrate preparation begins?
- What is the difference between an adhered manufactured-stone system, an adhered natural-stone system, and an anchored stone-veneer system, and why can their details not be mixed?
- Why is a scratch coat scored and cured before setting mortar is applied, and what happens if setting begins too early?
- What is "full contact," and what method confirms it after a unit has been set?
- Why is stone laid out and blended on the ground before any unit is set on the wall?
- What must the installer do, and not do, when excess setting mortar threatens to bridge a drainage cavity or block a weep?
- What cleaning methods are prohibited on finished stone faces, and why?
- What must happen if a substrate is discovered to be unsupported or unverified during this chapter?
- Why does this chapter require joint width to be measured at regular intervals rather than checked only at the end?
- What documentation must be filed with this chapter's worksheet, and why does it matter for Chapter 13?
Competency Rubric
| Competency | Independent Pass Standard | Not Demonstrated | With Assistance | Independently |
|---|---|---|---|---|
| RM-067 | Prepares the substrate, confirming WRB continuity, lath installation, or anchor supports exactly as the selected system specifies | |||
| RM-068 | Applies a scratch coat where required, to specified thickness, scoring pattern, and confirmed cure before setting | |||
| RM-069 | Selects the stone layout, blending size, shape, color, and texture and reserving corner and special units before setting begins | |||
| RM-070 | Sets stone veneer with full mortar contact, correct orientation, and no voids behind the unit, confirmed by sample test-removal | |||
| RM-071 | Maintains joint spacing consistent with the specified style within the stated tolerance | |||
| RM-072 | Inspects veneer adhesion and drainage, confirming support, joint depth, color distribution, clearances, and preserved weeps and cavities |
Mark one column per competency. Only Demonstrated Independently awards the competency; Demonstrated with Assistance authorizes additional supervised practice but does not complete the requirement.
Inspection Checklist — Stone-Veneer Installation Worksheet
| Item | Finding | Deficient / Stop-Work | Correction or Referral | Reinspected (Date) |
|---|---|---|---|---|
| Substrate / support | ||||
| WRB and lath continuity | ||||
| Scratch coat thickness / cure | ||||
| Layout and blend | ||||
| Full-contact setting | ||||
| Joint width and style | ||||
| Drainage and weeps | ||||
| Face cleaning |
System identified: ____________ Professional referrals made: ____________
Installation status: ______ (Complete / Conditional / Stop-Work) Date: ____________ Installer name: ____________
Performance Check
With the stone-veneer section installed, review the Stone-Veneer Installation Worksheet against the Acceptance Standards table and confirm every substrate, WRB, scratch-coat, setting, joint, drainage, and cleaning item has been recorded with a measurement, photograph, or source-document citation. Confirm the test-removed sample unit showed full mortar contact and that no drainage cavity or weep was found obstructed. Issue a Complete status only after every deficiency has been corrected and reinspected; a section with an unresolved stop-work condition does not proceed to Chapter 13 until the referred condition is resolved and a new inspection is performed.
Project Closeout
You have completed the twelfth chapter in the residential masonry sequence: installing stone veneer on a practice wall. This chapter required you to prepare the substrate (RM-067), apply a scratch coat where required (RM-068), select the stone layout (RM-069), set stone veneer (RM-070), maintain joint spacing (RM-071), and inspect veneer adhesion and drainage (RM-072).
You now have a complete, cured stone-veneer practice section with confirmed substrate, WRB, lath, scratch coat, setting, joints, and drainage. That section, along with its worksheet and photographs, carries directly into the next chapter: installing weep holes, flashing, and masonry drainage details at the base, opening, and shelf-angle conditions this system depends on.
File your completed Stone-Veneer Installation Worksheet, photographs, and system documentation with the Chapter 1 readiness plan for this project. You will reference this exact installation record throughout the rest of this book.